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August 3rd, 2007, 01:24 PM | #1 |
Trustee
Join Date: Feb 2004
Location: Brookline, MA
Posts: 1,447
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Noise dissipation formula
Is it possible to extrapolate the loudness in dB (A or C) of a source at some distance given its loudness nearby?
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August 3rd, 2007, 03:02 PM | #2 |
Inner Circle
Join Date: May 2006
Location: Camas, WA, USA
Posts: 5,513
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As I recall, sound drops off at the cube of the distance. It's the cube, because the sound waves spread out in three dimensions.
So, if you double the distance, the sound will fall off by a factor of eight (2^3), which is 9 dB (or is it 18 dB? I always get confused between power and amplitude.)
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